kdm and xset?

[debian]

I'm currently using kdm from a newly installed debian system. However the
mouse movements on it are much too slow, so I use 'xset m 6 6' to get the
speed I need/want. But I can't find where I'm suppose to put that command
so it would get run anytime kdm is run, or anytime when a wm is chosen.
Suggestions? Thanks in advance.